Air filter for heating and ventilating units



Nov.

wc SHURTLEFF 1,887,737

AIR FILTER FOR HEATING AND VENTILATING UNITS Filed April 16 1925 2 Sheets-Sheet 1 Nov. 15, 1932. SHURTLEFF 1,887,737

AIR FILTER FOR HEATING AND VENTILATING UNITS Filed April 16, 1925 2 Sheets-Sheet 2 Patented Nov. 15, 1932 WIRED SHUB'DLEFF, F EOLINE, ILLINOIS, ASSIGNOR TO THE 31mm NELSOK CORPORATION, 01' HOLINE, ILLINOIS, A CORPORATION 01 ILLINOIS Am FILTER FOB HEATIIIG- AND VENTILATING UNITS Application-filed April 16,

This invention relates to improvements in air filters for. heating and ventilating a paratus, and more articularly to devices o the character descri ed adapted'to be supported within such units for removing dust and other 5 in the housing of the apparatus to provide a simple and inexpensive arrangement which 1 is readil accessible for removal and renovation o the filtering material. The ventilating and heating apparatus of a typical design illustrated' in the accompanying drawings, discloses a preferred embodiment of the invention. f

Referring to the drawings,

Figure 1 is a front view of the apparatus with the front wall removed.

Figure 2 is a view of the apparatus in vertical section, taken on line 2-2 of Figure 1.

Fi ure 3 is a perspective view of the filterin evice removed, and

%igure 4 is a detail view of the filter suport. p The apparatus in which the filtering device is located consists ingeneral of an upright cabinet or housing, adapted to rest upon the floor of the room, and against the "outer wall thereof. In the lower part '01 thecabinet is a propeller fan 2, directly connected with a motor 3, mounted on a base 4, resting on the/ bottom wall 5, of the cabinet. The fan faces toward the rear wall 6 of the cabinet, with its intake side registering with a circular openin 6 therein which in turn registers with a orizontal duct 7 through the wall of the building and communicating with the outside atmosphere.

Above the fan is a radiator 8 extending horizontally the length of the cabinet along the front wall 9 thereof. Between the radi ator and the rear wall 6 is a vertical assage 10 with a vertical baflle plate 11 ad acent the same consists of two hinged together sections 1925. Serial 1T0. 88,523.- R 1E radiator. Above the radiator and extending along the forward edge of the to wall 12 is a discharge outlet in the form of a g'rille' 13 slightly inclined to the horizontal so as to direct the air outwardly as well as vertically. Suitable bafile plates 11-14 and a damper 15 regulate the passage of air upwardly from the fan, provision beinglthus made for the passage of all of the air t rough the radiator, or part through the radiator and part through the passage 11, for the purpose of regulating the temperature of the air delivered into the room.

Referring now to the filtering device, the

6 -16 extending lengthwise of the cabinet, between the fan and the radiator, and arching over the fan. Each section 16 is a fiat rectangular frame of a suitable construction, being preferably of metal with the top and bottom walls of woven wire or a 'coarse mesh.

7 As clearly shown in Fi re 3, each section is made in two parts, WhlCh no'rmall fit together, but are separable so that the a er or blanket 17 of filtering material may e removed for'the purpose of cleaning or replacement. The frame sections 16-16 are inged together at their ends, as at 18, so that they may be'folded together for convenien'ce in removing the same from the cabinet. In operative position the sections are self-.su porting, that is, they form an arch with t eir opposite ends. supported against the opposite end walls of t cabinet with their hmge edges being located just above the fan and just below the radiator. Narrow ledges 19-19 consisting of lengthsof angle iron riveted to the end walls of the cabinet about midway the height of the fan, support the ends of the sections. In this way the sections support themselves at an obtuse anle to' each other against the end walls.

anifestly the position of the filtering mem her is such that all of the air drawn into the cabinet and propelled u must pass throu h the filter before passin through the ra iator or passage 10, an thence delivered into the room.

I The front wall 9 of the cabinet is ordinarily removable to permit access to the fan and as a wardly by the fan motor, and hence the filtering member can be readily withdrawn, when it is necessary to clean the filtering material, the hinged sections makin it a simple matter to accomplish. Furt ermore,-the two hinged sections make it'possible to arch the frames over the fan, not only afiording a convenient and simple method of supporting the device, but securing the added advanta e of increased filtering area due to the inclmation of the two sections to the horizontal.

There are severaladvantages in the construction and method of mounting the filter in the cabinet to which attention may be directed. 1

It is customary in filterin devices of this character to saturatethe tering material with asuitable kind of oil, forthe purpose of facilitatin the filtering action, and as a result there is more or less dripping ofthe excess oil from the filter. With the arched form of filter, the oil works toward the lower ends of the frames, and thence down the. in-' side walls of the cabinet, and not onto the fan and motor as would be the case if the screen extended longitudinally across the cabinet. 7

Furthermore the hinged frame construction and arched arrangement of the sections, so ingthe filter to fit the cabinet, since an sli ht variations are taken up in the angu ar isplacement of the sections when the screens are inserted into the cabinet. In other words, the filters adjust themselves to the cabinet, and require only a flange at each end to support them. Ease of removal and replacement is also another important advanta e that is due to the arched construction. 40 claim as my invention:

' 1'. In a heating and ventilating unit of the character described, the combination with a housing having an inlet adjacent its bottom and an outlet adjacent its top; a fan inthe bottom of said housing adapted to draw air from the adjacent opening and to discharge said air upwardly; of means in the upper end of said housing providing a heating chamber and a passageway, both of which extend fromone side to the other of said housing, said passageway and heating cham-' her being open at the upper ends to discharge through the outlet in t e upper portion of the housing and being open at the lower ends and disposed in spaced relation with respect to said fan; radiators disposed in said heating chamber and. confined thereto; a filtering unit removably supported in said housing and comprisin hinged frames arranged at an obtuse an Ie to each other to form an arch over sai fan, the ends of said frames being sup orted against the opposite side walls of said housing, said filteringluinit spanning the distance between the de ng walls of the and entirely separating said avoids the necessity for accurately dimensionthe opposite side walls 0 sa1 fan from the heating chamber and passageway, whereby an increased area of filtering surface is provided for filtering all of the air prior to its passage through the heating chamber or passageway in the upper portion of said housing.

2. In a heatin and ventilating unit of the character descri ed, the. combination of a housing having an inlet adjacent its bottom and anoutlet adjacent its top, a fan in the bottom of said housing adapted to draw air from the adjacent opening and to discharge sald air upwardly; of means in the upperend of said housin providinga separated heating chamber and a passageway, said passageway and heating chamber dischargin through the outlet in the upper portion 0 the housing and having their 0 n ends disposed in spaced relation to sa-i fan and in position to receive air discharged therefrom, radiators disposed in said heating chamber, a filtering umt removably supported in said housing and comprising hinged frames 'arranged at an obtuse an le to each other to form an arch over said an, the ends of said frames being supported against the opposite side walls of said housing, said filterin unit spanning the distance between the de ing walls of the housing and entirel separating said fan from the heating chamber and assageway, whereby an increased area of fi tering surface is provided for filterin all of the air prior to its passage through the heating chamber or passageway in the upper portion of said housing.

3. In a heating and ventilating unit of the character described, the combination of a housing having an inlet adjacent its bottom and an outlet adjacent its top a fan in the bottom of said housing adaptedto draw air from the adjacent opening and to discharge 1 said air upwardly; of means inthe upper end of said housin providing a separated heating chamber and a passa ewa said passageway and heating'chamer ischargin through the outlet in the upper portion 0 the housing and havingtheir open ends disposed in spaced relation to said fan and in position to receive air discharged therefrom, radiators disposed in said heating chamber a filtering unit removably supported in said 1 housing and comprisin frame members arranged to form an arc over said fan, the ends of said frames bein sup ortedagainst d housing,"said filterin unit 'spannin the distance between the de ing walls of t e housing and entirely se a'ratm sald fan from the heating cham or an v passageway, whereby an increased I area 0 filtering surface ds/provided for filtering all of the air rior to its passage through the heating cham er or passageway in the u per portion of said housin 4. A satin and ventilating umt comprising an one using casing having an inlet chamber at its bottom, a discharge chamber at its top, heatin and by ass chambers between the top an bottom c ambers; a blow, er disposed in a chamber below the heating and byass chambers and adjacent the inlet cham er; and a filter arranged in the easing below the heating chamber whereby fresh air entering the inlet chamber may pass through the filter before entering, the heating chamber.

5. A heating and ventilating unit comprising an inclosing casing having an lnlet chamber, a discharge chamber, heating and by-pass chambers; a blower chamber; and filtering means disposed in the path of the air through the unit and adapted to clean the air during its passage to the heating and bypass chambers.

Signed at Moline, 111., this 9th day of April 1925.

WILFRED SHURTLEFF. 

